I'm using Lightroom 4.1 to review, cherry pick and postprocess a bunch of Canon RAW photos from a big shooting session. I use the Library view in Loupe mode to review the photos and pick up the best ones. When I finish staring at one photo and optionally press B to add it to the quick collection for later processing, I press the → button to go to the next photo.
The problem is that the process of switching to the next photo is quite slow. My photos are located on a home server on the other end of a Gigabit ethernet cable, so the data transfer itself should be fast. So I suppose that most (CPU) time is spent doing something with the photo, like resizing to fit the screen, applying WB, etc.
Anyway, is it possible to tell Lightroom to preload photos in advance to speed up each switch to the next photo? So that I may leave it open for several minutes, and it would process, say, first 50 photos starting from the currently selected one.